Regarding the F-CS+:
If a F-CC+ would show up in the ship yards... I would buy the damn thing.
The NCL+ doesn't have the moxie to take on a I-CAY.
The extra hull of the CS+ means you can take a few more chances to inflict damage on the enemy without being crippled.
Ask Nemo. 2 passes and my NCL+ was a wreck and heading for the border.
Unfortunately, the shipyard is full of stuff CS+'s, NCL+'s, and specialty ships.